Sofa



FIG. 1 is a front perspective view of a sofa in accordance with the newdesign;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevation view thereof; and,

FIG. 4 is a back perspective view thereof.

Broken lines shown on the sofa are understood to represent stitching.

The ornamental design for a sofa, as shown and described.